When you do it once, it’s just a victory. When you do it twice, it’s a realignment.

The coalition that Barack Obama put together to win the presidency handily in 2008 looked a lot like the emerging Democratic majority that optimistic liberals had been discerning on the political horizon since the 1990s. It was the late George McGovern’s losing coalition from 1972 finally come of age: Young voters, the unmarried, African-Americans, Hispanics, the liberal professional class – and then more than enough of the party’s old blue collar base to hold the Rust Belt for the Democrats.

But 2008 was also a unique political moment, when George W. Bush’s immense unpopularity was compounded by a financial collapse, and when the possibility of electing the country’s first black president fired the imagination of the nation (and the nation’s press corps). So it was still possible to regard the Obama majority of ’08 as more flukish than transformative – or at the very least, to see it as a fragile thing, easily shattered by poor choices and adverse developments.